Broken HUT inventory

It seems the inventory in HUT, if you can call it that, is broken. Player cards and collectibles I've earned can randomly disappear and reappear. For example, I received six Game Breaking collectibles and tried to trade them for player 95, but they weren't selectable. After a while, they appeared. This behavior often occurs when trading sets in TOTS: cards appear, then disappear. Auto Fill also sometimes doesn't work, although manually selecting cards from your collection works. I think this started with the TOTS event, but it might be related to the hidden Grudge Match tasks. Also, Inbox sometimes shows that there is something in it, but when you try to open it, it shows a message that it is empty.

Also, Inbox sometimes shows that there is something in it, but when you try to open it, it shows a message that it is empty.

Or, after adding a card to one set, that card remains available for another set. For example, I added the Josi 86 card to the Spurgeon 90 Captain's Set, but the same card is still available for selection in the Exchange Set for 88-89.